Depends how big your CA/SAs are. Danios were the only fish I could keep alive with my piranhas, because they were so small and fast. If you get 10+ im sure the slow ones will all die, but you may be lucky enough to get 5-6 really fast ones. Or you could have good hiding spots and bank on that.
Danios are pretty awesome schooling fish (especially for the price), and may or may not work depending on your tank setup and size of fish.